Lens-measuring device.



WITNESSES H. L. DE ZENG.

LENS MEASURING DEVICE.

APPLICATION FILED NOV. 19. m2.

1,218,243. I Patnted Mar. 6,1917.

2 SHEETS-SHEET 1. f

Zi Z5 INVENTOR H. L. DE ZENG.

LENS MEASURING DEVICE.

APPLICATION FILED NOV. 19, 1912.

1,218,243. PatentedMar. 6,1917.

2 SHEETS-SHEET 2.

WITNESSES 'by which'the'angle'of the cylindrical axis ETMTEB re ns Peinnir orrron.

HENRY L. DE ZENG, OFiMAPLESHADE, new JERSEY.-

LENS-MEASURING; pnvrcn' To all whom it may concern: i

Be it known that I, HENRY. L. DE ZENG, a citizenlof the United States, residing at Maple Shade, coiiinty of. Burlington, State of New Jersey, have invented anew and use:

ful Lens-Measuring Device, of which the focal length of cylindrical and spherical lenses may be. measurechandalso the angle of the'cylindrical aXis of the same.

It further consists in providing a support and a' lens measurer, whereby the focal length of cylindrical and spherical lenses,

well as the angle of the cylindrical axis of the lenses, may be measured.

It further consists-cf. a plurality of contact points, whichv areadapted to be moved" over the face'of a'lens, with 1nd1cat1ngmech-- anism by wh1chtherelat1ve position of the points is shown, within'dicating mechanism,

of the lens is shown, and means for supporting the lens.

It further: consists ofother novel features of construction, all as will be-hereinafter fully set forth. p

The annexed drawings and the following description set forth in detail one mechanical form embodying the-invention, such detail construction being. but one of various mechanical forms in which the principle of the invention may bezused.

Figure; 1 represents in elevation a lens measuring. device embodying my invention.

Fig. 2 represents aplan ofalens support employed. j I

Fig. .8 represents-a vertical sectional view on line 33 Fig. 4', showingthe lens measurer in position. v a

Fig. 4 represents a sectional view-online 4l4..F1-g. 1.

Fig. 5-represents a sectional view on line 55, Fig. 2.

Fig. 6 represents a side elevation of the lens measurer, with the closing disk removed;

Fig. 7 represents an justable radial support employed.

Figs. 8 and 9-represent elevations of modifications of a portion ofthe mechanism employed, in detached position.

elevation of an ad Specification of Letters Eatent Patgntedlhia g. 6,. 1 91 7 ApplicationzfiledNovember 19,1912," Seria1N0.732,198 i Fig. 10 represents a sectional view of a 7 construction, showing means for laterally ad usting the contact points and the supporting. sleeves therefor.

Similar numeralso f referenceindicate corresponding "parts in the figures.

Iteferring to"- the drawings 1 designates a lens} measuring device embodying my invention, the same consisting of a lens holder or support 2, and a lens measurer proper-'3, the parts being adapted tobe removably and-operatively connected, as desired, inorder to accomplish ther'esi'ilt. The lens holder or support" consists of a framel, which is provided with a suitable opening 5, at which the lens to-be tested is held. 3 Inthe present instancml have shown upon one side of the. frame 4,-two movable plates 6;,flwhich are-located upon oppositesides ofythe opening 5 in said frame, and whichfplates are movably held in posltion and guided in their movement by suitable means. In: the present instance, I have shown. screws or pins 7, which pass throughand are movable in. slots 8', formed in'the. Y

said frame, said screws or pinsextending through to the opposite side of the: frame 4, fronr that'upon which plates: Gare located, and said screws or pins 7 are movable incam slots19: formed' in a; rotatable lever ormember 10," which latter is rotatably mounted on the framel, andhasone'end of a spring 11 connected therewith,.said spring beingalso connectecbwith the frame 4, in order that said. spring 11 will normally hold the lever 10 inproper' position, and return the same thereto, and"v will cause a-suitable 7 portion :of the plates '6 to engagewith the lens, when in position; Thelever 10 isprovided-witha finger-piece 12, for operating the same,' and the plates fi are hereshown as provided withor carrying engaging ears 18',-wh1ch-pro ect suitably for grasping or.

engaging; the edge ofv the lens,- to bei'tested,

to hold the same in proper position with-respect toatheopening5inthe frame 4: .These.

engaglngears may be of any suitable ordesirable form required, as I do not desire to be limited to the type here shown. Carried by theframe 4 is'a sleeve'14l, which is secured in the opening5' of the frame, and which.proiectspreferably: a suitable distance.

upon each side of the frame.- Rotatably mounted in the sleeve 14 is a collar 15, which,

as'here'shown, is-provided with aflange or lug? l6,'en'gagingwith the sleeve 14, and the sleeve 14 and have placed the indicator 19 upon the collar. As here shown, the collar is provided with grooves 20 upon its inner face, the same serving as themeans for removably and operatively connecting the lens holder or support 2 with respect to the lens measurer 8. Any suitable form of lens measurer may be employed, which properly c0- acts with the lens support, and for the pur pose of illustrating my invention, I have shown in the drawings one form thereof which is at present preferred by me, since the same has been found in practice to give satisfactory and reliable-results, although it is to be understood that the various parts may be variously arranged and organized and that my invention is not limited to the precise arrangement and organization, as herein shown and described.

The lens measurer consists of a casing 21 carrying a block 22, the same being connected with or carried by the said casing in any suitable or desired manner. Adjustably supported within the casing is an arm or .member 28, which may be of any suitable form, and which, as here shown, is provided w1th a slot 24, 1n whlch 1s seated a set screw 25 for lockmg the arm wlth respect to the casing 21, it being understood that the end of said arm can be moved in an arc of a circle with respect to its center of rotation, and locked in its adjusted positions by means of the said set screw 25.

Pivotally mounted at a suitable point on the arm 28, with respect to its center of rotation of the casing 21, is a lever 26, which, as here shown, is pivoted at 27 to said arm, said lever having a rack -or segment 28 upon one end and having an offset 29 adjacent the opposite end. The rack 28 is adapted to mesh with a pinion 80 carried by a spindle or shaft 81, suitably mounted in the casing 21, and to which spindle is connected a spring 82, which is also connected with a suitable stationary point, in order to hold the spindle in normal position and to return the same thereto.

84 and 85 designate contact points, which are here shown a-smounted in the block 22, said points 84 and 85 being adjustably and normally fixedin relation to the recording mechanism through the medium of the block.

86 designates springs in suitable relation to said contact points in order to hold the the disk same normally in fixed relation to said block and permitting adjustment therebetween.

88 designates a rod or member for supporting the said contact points, and for adjusting them simultaneously. Said rod 88 may be integral with said points, as shown in Fig. 8, or separate therefrom and bearing thereupon, as shown in Fig. 9.

As here shown, I have mounted a set screw 87 at a suitable point, in order to bear against the rod 88, so that by movement of the said set screw 87, the said rod and so the contact points 84 and 85 may be adjusted and held in fixed relation to the indicating mechanism, it being understood that the said screw eii ects a simultaneous adjustment of said contact points. A suitable opening 88 is provided in the casing 21 for access to the said screw 87. Movably mounted in the block 22 is the movable contact point 89, which is provided with means, such as a shoulder or head 40, to prevent improper escape from the block 22, and the end of said contact point 89 is here shown as bearing upon the ofiset arm 29 of the lever 26, so that movement of the said contact point 89 inwardly, will actuate the lever 26 to throw the rack 28, in order to rotate the spindle 81 against the tension of the spring 82, the lat ter returning the spindle, when the pressure upon the movable contact point 89 is removed. The casing is closed by a disk or plate 41, provided with suitable notations or a scale 42, and said disk 41, is here shown as held in place by an annular cap 48.

Mounted upon the spindle 81, exterior of 41, is a pointer 44.

Attention is directed to the fact that by pivot-ally supporting the segment lever 26 upon the radially adjustable arm or mem ber 28, the fulcrum may be varied, that is to say, that by increasing or decreasing the distance between the pivotal point of said lever, and the pointof contact of the said oompressible contact point, with the said lever, the throw of the indicating mechanism may be increased or decreased, as required. This result may be accomplished in various ways, several of which are shown in thedrawings. For example, in Fig. 8, I have shown alaterally adjustable member 45, mounted on the movable contact 89, said member bearing upon the off-set arm 29 of the segment lever 26, so that the same efiect is obtained.

In Fig. 9, I have shown a contact member 46, adjustably mounted on the segment lever 26, the movable contact point 89 bearing upon the said contact member 46, so that the same effect, as previously described, is ob tained. I have also shown in this figure, the rod 88 as separate from the contact points 84 and. 85 and bearing against the same, which will operate in the same manner as if the said rod 88 were integral with the said contact points 84 and 85, in order to accomplish thedesired adjustmentof the same, and for holding: the said v contact points in fixed relation to the indicating;

mechanism, as previously stated- The throw of the indicating vmecha-nismcan also be increased or decreased by'the lateral adjustment of the fixed contact points with relation to the movable contact point, and as an example for accomplishing this result, I have shownin Fig. 10, the mov able contact point 39 passing through, a; sleeve or support 47, with the normally fixed contact points 34 and 35 mounted in sleeves or supports 48 and 49, whichare adaptedito be laterallyadjustedwith respect to the said support 47, and, in the presentiinstance, by

means of the set screws 50. Should it' be desirable, I may provide additional means for holding the contact points 34 and 35 immov-'- able with -respect to the block 22, and in Fig. 8, I have shown set screws 51 as an example of such additional means. Theoperation of the device will be readily appar-' ent.

The contact points'of the lens measurer are adapted to be brought into contact with.

' the surface of the lensto bemeasured,

whereupon the central or movablecontact point projecting normally beyond the others, wi l be depressed with respect to the other two contact points, and with respect to the curve of the surface of the lens with which it is in contact. This movement or change of position of the movable contact point 39 with respect to the fixedpoints 34 and 35 will actuate the segment lever 26, causing the segmeitit 28 thereof to actuate the spindle 31 carrying with it the ointer 44, in order that the same will be moved to a point upon the scale of the disk 41 to indicate the radius of curvature or focal length of the lens, by which means the said radius of curvature or focal length isaccurately measured and determined.

"When it is desired to determine the angle of the cylindrical axis of the lens, I have provided the support 2, in which the lens is placed and held by the engaging ears 13, by a proper actuation of the mechanism described, so that the said lens will be firmly supported therein and held in position with respect to the opening 5 in said support. The lens measurer is then brought into suit able connection or engagement with the support, by inserting the block 22 into the slots 20 of the collar 15 of the support 2. The lens measurer can then be rotated with respect to the support, with the contact points contacting with the surface of thelens so supported. The movable contact point 39 will accommodate itself to the variations in the lens surface with respect to thefixed contact points 34 and 35, which will cause a movement of the indicating mechanism and of the indicator pointer 44, so that the amount of variation; between the dilferent meridiansof the lensasurface, will be indi catedwand measured. At the same time, the relative. angular positionof the said lens measurer with respect toithe sa1d lens sup port, is indicated and measuredbymeans of I I thescale 18 and indicator19, so that theangle of the cylindrical axis-of a lens may be measured through the contact of the; said contact points with the surface thereof. In like fashion, the angle of any given meridian of a lens may be determined, as in toric lenses, etoi It will be understood that when the three contact pointsare in directalinement with the axis of anlain cylindrical lens, thesaid contact points will be in exact relative hori-l z'ontal' alinement. When the said contact points are in a position at right angles with the cylindrical axis or a plain cylindrical lens,- the niaximumradius of curvatureof the}: cylindrical :lenswill then be indicated upon the dial. It is therefore obvious that a rotation of the contact pointsupon the surface of a cylindrical'lens, will indicate thejexact' meridian of ts cylindrical axis,

zero being indicated upon the dial when the three contact points are-in-lexact'alinement with the cylindrical axis of the lens, in which meridian of a plain cylindrical lens there is no focalpower.

VVhile I have shown and described the scale and indicator, for measuring the angle of the axis of a cylindrical lens when mounted upon or carried by the support 2, it will of course be apparent that these parts may be variously arranged and supported in any suitable manner, in order that they will indicate and measure the relative angular position of the contacting parts of a lens measurer with respect to a lens carried by the support when the measurer and support are conjunctively engaged.

Having thus described my invention, what I claim as new and desire to secure by Let- I ters Patent, is

1. In a lens measurer, members adapted to contact with the surface of a lens, indi-. cating mechanism connected therewith, a lens support having means for engagement with said contacting members, means on said ating simultaneously with respect to a common center, and means for determining the relative angular position of said contacting members with respect to any meridian of said lens. I

3. In a lens measurer, members adapted to contact with the surface of alens, indicating mechanism connected therewith, a lens support rotatably mounted with respect to said contacting members, means on said lens support for gripping a lens, said gripping means operating simultaneously'with respect to a common center, and means for determining the relative angular position of any required meridian of said lens with respect to the major axis of an elliptically shaped lens.

4. In a lens measurer, members adapted to contact with the surface of a lens, indieating mechanism connected therewith, a lens support detachably connected with said contacting members, "means on said support for gripping a lens, said gripping means operating simultaneously with respect to a common center, and means for determining the relative angular position of the cylindrical axis of the lens with respect to the 180 meridian thereof. v

5. In a lens measurer, two normally fixed contact points, a movable contact point in suitable relation therewith, an adjustably fixed segment arm upon which said movable contact point directly bears, indicating mechanism adapted to be suitably actuated by said segment arm, whereby the relative position of said movable contact point with respect to the said normally fixed contact points may be determined, and means for simultaneously adjusting said normally fixed contact points in a direction in the lines of their axes.

6. A lens holder or support, which comprises in combination, means for holding a lens, a support for said holding means, indicating mechanism for supporting the holding means, mechanical interfitting means for effecting actual connection between said holding means and said indicating mecha nism, and means for determining the angle of any required meridian of a lens with respect to the meridian of zero thereof.

C. D. MOVAY, N. BUSSINGER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

